精黄石化学分析方法初探

精黄石又称黄浆石 ,产于自贡。精黄石早在明清就作为建筑石材 ,2 0世纪 90年代自贡市鸿鹤化工股份有限公司首先开发利用作为新型的化工防腐材料 ,效果良好 ,经济效益可观。精黄石由于具有许多优良的性能 ,越来越多地受到有关专家的重视。研究精黄石的分析方法 ,不仅填补了这方面的空白 ,而且对精黄石的开发利用提供科学依据。精黄石的主要成分是ＳｉＯ2 ,并含有少量的铁、铝、钙、镁等。在无机材料中ＳｉＯ2 的测定方法比较多。主要有盐酸二次脱水重量法[1] 、盐酸一次脱水钼蓝光度法[1,2 ] 、动物胶重量法[3] 及其它方法[4～ 8]等。通过试…     

欢迎订阅《化学分析计量》及合订本光备 《工程塑料应用》及合订本光盘

欢迎读者直接通过邮局或银行汇款向《化学分析计量》杂志社订阅《化学分析计量》及合订本光盘、《工程塑料应用》及合订本光盘，请注明订阅期刊／光盘的名称、收件人、邮编及地址。     

安培检测芯片毛细管电泳及其初步应用

An end-channel amperometric detector with a guide tube for working electrode was designed and integrated on a home-made glass microchip. The guide tube was directly patterned and fabricated at the end of the detection reservoir, which made the fixation and alignment of working electrode relatively easy. The fabrication was carried out in a two-step etching process. A 30 μm carbon fiber microdisk electrode and Pt cathode were also integrated onto the amperometric detector. The baseline separation of dopamine (DA), catechol (CA) and epinephrine (EP) was achieved within 80 s. Relative standard deviations of not more than 5.2% were obtained for both peak currents and migration times of DA and CA (n=5). Using standard adding method, DA in tLrine and plasma samples was detected. The recoveries were in the range of 83%—103%.     

A Novel Plasticizer for the Preparation of Thermoplastic Starch

TPS was a biodegradable material based on starch. Starch was an inexpensive and natural renewable polysaccharide, which was widely investigated as the substitute of petroleum-derived plastics. Native starch commonly existed in granule structure with about…     

集成滤波器在谱图信号除噪中的应用

本文提出了一种由神经元网络与线性自适应滤波器组成的集成滤波器的实现方法，用于谱图信号除噪处理。     

国内冶金企业急需提高钢铁分析检测的仪器化

传统的钢铁分析检测过程，是以手工化学分析也就是人们常说的“湿法分析”方法为主。这种分析方法过程长、强度高、功能单一、稳定性差、人为误差大。     

铜中杂质成分标准物质的研制

介绍铜中9种杂质成分标准物质的研制方法。以1号纯铜为基体，配入硫、铁、铅、锌、镍、铋、锑、磷、砷及锡共10种杂质成分，采用雾化喷粉加工工艺，保证了样品的均匀性。对样品表面作了抗氧化保护处理。采取多家实验室协作定值的方式对除砷外的9种杂质成分进行定值。5年的跟踪检验结果表明，该标准物质稳定性良好。     

Determination of Dopamine in the Presence of Ascorbic Acid on the IrO2-Ta2O5 Type DSA Electrode

IrO2Ta2O5 (70%: 30%, molar ratio) electrodes (ITEs) were prepared by the thermal decomposition method. Typical “mud-cracked” surface and surface enrichment of Ta were observed. The determination of dopamine (DA) was carried out in the presence of ascorbic acid (AA). The detection limit of DA was 5~10 5 mol/L without the interference of AA.     

Study of Tea Digitized Chromatographic Fingerprint Spectra Using Micellar Electrokinetic Chromatography

IntroductionTeaisthemostwidelyconsumedbeverageinpeople’slife .Theheightenedpopularityofthisbeveragethroughouttheworldinrecentyearsmaybedueinparttotheevidenceofarelationshipbetweenteaconsumptionandpreventionofcertainformsofhumandisease .Themaincomponentsofteaarepolyphenoliccompounds ,commonlyknownascatechins ,whichrepresentagroupofcom poundsbelongingtotheflavonoidfamily .Thesecom poundsarewidelydistributedinthetealeavesandconsti tuteupto 30 %ofthedryleafweight.1Muchinteresthasbeenfocusedoncat…